Mechanical respirator.



L. WIDEMAN.

MECHAMCAL RESPIRATOR.

APPLICATION FILED 0 mm. 1913.

1 ,1 9,9 1 8, Patented Sept. 5, 1916.

2 SHEETSSHEET I.

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I v A fvfforney LOUIS WIDEMAN, OF WORCESTER, MASSACHUSETTS.

MECHANICAL BESPIRATOR.

Specification of Letters Patent.

Patented Sept. 5, 1916.

Application filed December 13, 1913. Serial No. 806,625.

To all whom it may concern Be it known that I, LOUIS W1DEMAN, a citizen of the United States, residing at lVorcester, in the county of l/Vorcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Mechanical Respirators, of which the following description, taken in connection with the accompanying drawings, is a specificatlon.

This invention relates to mechanical means for inducing respiration in cases of apparent death from drowning, asphyxiation, or suffocation, by mechanism which alternately inflates and exhausts the lungs of the victim and so restores, if possible, natural respiration.

One object of this invention is to produce an apparatus of the above character in a portable and convenient form, whereby it may be moved readily from place to place and quickly set up for operation with the least possible delay and inconvenience.

Another object is to provide means in apparatus of this character by which a mixture of oxygen and air may be forced into the lungs of a patient, and to provide means whereby the proportions of the gases entering into such mixture may be varied at will by the operator.

Another object is to provide means by which the oxygen, which is retained in a tank under high pressure, may be utilized at approximately atmospheric pressure.

Another object is to provide an efficient and easily applied face piece for attachment over the nose and mouth of a patient.

In order that the invention may be readily understood, the apparatus will now be described in connection ;with the accompanying drawings, in which Figure l is a plan'view f the apparatus with the parts thereof connected together and in operative position. Fig. 2 is a longitudinal central sectional view of the twin pumping cylinders and pipe connections thereto. Fig. 3 is a plan view of regulating valve for controlling the proportions of oxygen and air. Fig. 4 is a transverse central sectional view of the valve shown in Fig. 3. Fig. 5 is a view showing the face piece applied to the head of a patient. Fig. 6 is a side elevation of the face piece, and Fig. 7 is a section on line 7-7, Fig. 6.

Like numerals refer to like parts in the several views.

The apparatus is carried in a rectangular box or case 1 having a cover 2 hinged thereto as at 3. Attached to one side of the box and to the adjacent side of the cover is a chain 4 adapted to retain the cover in an inclined position, as shown in Fig. 1, when the latter is swung back to open the box. Carried in the bottom of the box and suitably secured thereto, is a horizontally disposed tank 5 containing compressed oxygen. Also secured to the bottom of the box are a pair of horizontally disposed parallel pump cylinders 6 and 7, in which are located respectively the plungers 8 and 9, the cylinder 6 with its plunger 8 constituting a pressure means, and the cylinder 7 with the plunger 9 a suction means. A U-shaped member 10 has its free ends connected respectively to said plungers 8 and 9 to serve as a common actuating means therefor, and at its other extremity it is attached to one end of a link 11. The other end of the link 11 is pivotally attached to an intermediate point of an operating lever 12 pivoted at one end, 13, to'the bottom of the box 1. The oscillation of the lever 12, by means of a handle on its free end, imparts a reciprocating motion to the plungers 8 and 9 as will be readily apparent, and the degree of this oscillation is limited by stops 14 at the ends of a curved bar 14k secured to the bottom of the box beneath said lever 12.

A collapsible bag 15 carried by the cover 2, is provided with ears or flaps 16, by means of which the said bag may be retained in its folded position against the'cover 2 when not in use, said flaps being provided with suitable fastening devices for attachment to the cover 2. The interior of said bag is connected with the oxygen tank 5', by means'of a pipe 17 having therein an ordinary throttle valve 18 whereby to controlth'e passage of oxygen from the tank to the bag. Leading from the other end of the bag 15 is a pipe or tube 19 which connects the interior of the bag with a valve casing 20. The said valve casing 20, as shown in Fig. 4, has a connection 22 with the atmosphere diametrically opposite to its connection with the oxygen pipe 19. Within the casing 20 is a valve 21 comprising an oscillatory semicylindrical member adapted, when swung in one direction, to cooperate with said diametrically opposite connections to admit more oxygen and less air, and when swung in the opposite direction, to admit less oxygen and more air, as clearly seen in Fig. 4:. The stem of the valve on the exterior of the casing 20 is provided with an indicator 23, and the latter is movable over a graduated plate 24, for the purpose of adjusting the proportions of oxygen and air as may be desired. The casing 20 has a connection between the connections 19 and 22 which communicates with the interior of the pump cylinder 6 by means of a coupling 25, provided with an inwardly opening check valve, whereby a mixture of oxygen and air drawn into the pump cylinder 6 will be prevented from passing back into the casing 20. Also in communication with the interior of the pump cylinder 6 is a coupling 26 provided with an outwardly opening check valve, adapted to permit the passage of a mixture of oxygen and air to a pipe 27. The pump cylinder 7 has leading thereto coupling 28 provided with an inwardly opening check valve adapted to permit the passage into the cylinder of products of respiration from a pipe 29, The pipes 27 and 29 are brought together at the connection 30v leading to the interior of the face piece 31, which takes the form of an inverted cup, of flexible material. lhe face piece 31 along its edge is provided with a pneumatic cushion 32 which is conveniently inflated by means of a flexible tube 33 having a suitable clip or stop thereon.

Surrounding the connection 30 and extending outwardly from the same on either side is a bar 35, each end of which is adapted to enter any one of a series of slots 36 formed in the adjacent portion of a strap 37, each end of which is connected to the adjacent ends of a pair of converging springs 38 on both sides of the patients head. At their other ends the springs are connected to bars 39, and said bars 39 are joined by the cross straps 40 and 41 at the back of the head, whereby the face piece 31 is yieldingly and adjustably held in position over the nose and mouth of the patient.

In operation, the movement of the plunger 3 to the left, in Fig. 2, fills the cylinder 6 with a mixture of oxygen and air, the proportions of which have been previously determined upon by adjustment of the valve 21. The oxygen is drawn through the collapsible bag 15 at a rate which will barely keep said bag in a state of inflation, and for this purpose the throttle valve 18 is provided so as to prevent an excess pressure of oxygen. On the corresponding stroke of the plunger 9 to the left, in Fig. 2, the products of respiration are exhausted from the limgs of the patient into the pump cylinder 7.

When the two plungers simultaneously move to the right the mixture of air and oxygen previously drawn into the pump cylinder 6, is forced through the pipe 27 into the face piece 31 and inflates the lungs of the patient, while the waste products in the pump cylinder 7 are permitted to pass by the plunger 9 by reason of the arrangement of the inward packing disk 42 thereon which provides a gas tight fit with the walls of the cylinder only when the plunger 9 is moving to the left. The reciprocation of the plungers is continued until natural respiration is induced and when this occurs a screw cap 13 on the face piece may be re moved to permit the patient to inhale and exhale atmospheric air.

I claim,

In a mechanical respirator, a suction device and a pressure device, a source of compressed oxygen supply, means for admitting a mixture of oxygen and air to said pressure device, comprising means for reducing the pressure of the oxygen passing from paid supply, and a valve for adjusting the proportions of air and oxygen, disposed be tween said .pressure reducing means and said pressure device, and having an inlet for atmospheric air, in quantities inversely proportional to the quantities of oxygen passing through said valve, and means for operating said suction device and said pres sure device alternately from a common actuating device.

LOUIS VVIDEMAJ.

Witnesses PENELOPE CoMBERBAoH, 'NELLIE lVnALEN.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

